⚗️ Part 1: Writing Chemical Equations from Word Equations

a) Hydrogen + Oxygen → Water

b) Methane + Oxygen → Carbon dioxide + Water

c) Nitrogen + Hydrogen → Ammonia

d) Iron + Oxygen → Iron oxide

Water:

Carbon dioxide:

⚖️ Part 2: Balancing Chemical Equations

a) _____ H₂ + _____ O₂ → _____ H₂O

b) _____ CH₄ + _____ O₂ → _____ CO₂ + _____ H₂O

c) _____ N₂ + _____ H₂ → _____ NH₃

d) _____ Fe + _____ O₂ → _____ Fe₂O₃

🔬 Part 3: Conservation of Mass

In a chemical reaction, mass cannot be _____________ or _____________. This means that the total mass of _____________ must equal the total mass of _____________. When we balance chemical equations, we ensure that the same number of _____________ of each element appears on both sides of the equation.

🧪 Part 4: Advanced Practice

a) Magnesium + Hydrochloric acid → Magnesium chloride + Hydrogen

b) Calcium carbonate → Calcium oxide + Carbon dioxide

c) Aluminium + Copper sulfate → Aluminium sulfate + Copper

a) In a balanced equation, the number of atoms of each element is the same on both sides.

b) Coefficients can be changed to balance equations, but subscripts cannot.

c) The arrow in a chemical equation means "produces" or "yields".